Bandwidth control device and bandwidth control method

A bandwidth control device of a group formed by a first bandwidth control device and one or more second bandwidth control devices, the bandwidth control devices comprising:

• a management unit configured to subtract, when the first bandwidth control device or the one or more second bandwidth control devices allow a packet to pass, an amount of the passed packet from a permissible passage amounts to be passed the first bandwidth control device;
• and
• a correction unit configured to correct the permissible passage amount of the first bandwidth control device or a threshold value of the first bandwidth control device based on a result of a comparison between a first ratio of a passage amount to an input amount of a packet of the first bandwidth control device and a second ratio of passage amounts to input amounts of packets of one or more second bandwidth control devices,
• wherein the first bandwidth control device is configured to determine whether a packet is to be allowed to pass through or not based on a result of a comparison between the permissible passage amount and the threshold value and to allow the packet to pass or discard the packet according to the determination result.

A bandwidth control method of a bandwidth control device of a group formed by a first bandwidth control device and one or more second bandwidth control devices, the bandwidth control method comprising:

• subtracting, when the first bandwidth control device or the one or more second bandwidth control devices allow a packet to pass, an amount of the passed packet from a permissible passage amount to be passed the first bandwidth control device;
• correcting the permissible passage amount of the first bandwidth control device or a threshold value of the first bandwidth control device based on a result of a comparison between a first ratio of a passage amount to an input amount of a packet of the first bandwidth control device and a second ratio of passage amounts to the input amounts of the packets of one or more second bandwidth control devices;
• determining whether a packet is to be allowed to pass through or not based on a result of a comparison between the permissible passage amount and the threshold value;
• and
• allowing the packet to pass or discard the packet according to the determination result.